JPH0359835A - Information recording and reproducing system - Google Patents

Abstract

PURPOSE:To easily constitute a reproducing device of high reproducing efficiency by making reproducing electromagnetic radiation incident upon a recording medium recorded with information as an object of recording and reproducing the electromagnetic radiation showing its intensity variations in accordance with the recording information. CONSTITUTION:Information to be an object of recording is recorded on the information recording medium RM under such a recording mode that a photo modulation material layer member PMLm having a memory effect of the information recording medium RM is operated to make the reproducing electromagnetic radiation variable in intensity in accordance with the information to be the recording object. The reproducing electromagnetic radiation is incident upon the recording medium recorded on the photo modulation material layer member PMLm having a memory effect of the information recording medium RM with information as an object of recording by the above- mentioned recording means, and the electromagnetic radiation showing its intensity variations in accordance with the recording information is reproduced. By this method, the reproducing device of high reproducing efficiency can easily be constituted, and in addition, for example, such information as a still picture can excellently be reproduced as well.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to an information recording/reproducing method.

(Prior Art) As the demand for recording various information signals at high recording densities has increased, in recent years, information recording media created based on various structural and operating principles have been used to record information signals at high recording densities. High-density recording and reproduction of information has been performed, and conventionally, for example, by irradiating the recording layer of an information recording medium with a recording beam whose intensity is modulated by the information signal, the recording layer of the information recording medium can be As an information recording medium that records information signals by causing physical or chemical changes, it has optical and/or electrical characteristics (light transmittance, reflectance, absorption rate, etc.).

It has two or more stable structural states with different electrical resistance and other properties, and it undergoes a transition between the above-mentioned stable structural states by applying external optical, electrical, or thermal energy. For information record #i media belonging to the phase change type in which the material (inorganic material, organic material) is formed into a film by applying the vapor deposition method or sputtering method on the substrate and used for the record S layer, only once. Active research and development is being conducted to put optical discs into practical use as file memories for offices and other uses, such as optical discs that can be added by users (write-once optical discs) and erasable optical discs.
It is well known that various types of devices have been proposed, such as magneto-optical type, pit-forming type, bubble or unevenness-forming type, and magneto-optical type. Proposals have also been made for information recording media that are capable of recording information signals as high-resolution charge images, and are equipped with a charge retention layer having a light modulation function.

It is well known that many proposals have been made regarding recording and reproducing methods for recording and reproducing information to be recorded on the many types of information recording media described above.

FIG. 4 is a block diagram showing an example of the configuration of a recording system that records information to be recorded and reproduced as a charge image using an information recording medium that records information to be recorded as a charge image. So, in this figure 4, ○ is the subject, L
is an imaging lens, vb is a power source, WH is a recording member (writing head) consisting of a laminated structure of an electrode Et and a photoconductive layer member PCL, and RM is a laminated structure of a charge retention layer member IL and an electrode E. This is an information recording medium for recording charge images. Although the information recording medium RM illustrated in FIG. 4 has a structure in which the charge retention layer member IL and the electrode E are simply laminated, the information recording medium RM has a structure in which the charge retention layer member IL and the electrode E It may also be configured such that these are stacked on a substrate.

The electrodes Et and E described above can be constructed using, for example, a thin metal film, a Nesa film, etc., and the leading ffi,
The five-member PCL can be constructed from a thin film of a suitable photoconductive material. Further, the charge retention layer member IL is constructed using a dielectric material having a high insulation resistance value, and for example, one constructed using a suitable polymeric material film is used.

In the recording system shown in FIG. 4, the transparent ff1NiAEt in the write head WH has a power supply vb
The negative electrode of the information recording medium RM is connected to the electrode E of the information recording medium RM, and the positive electrode of the power source vb is connected to the electrode E of the information recording medium RM.

In the recording system of FIG. 4, the optical image of the object O is guided by the writing head WH by the imaging lens L? When imaged onto the Ii layer member PCL, the electrical resistance value of the photoconductive layer member PCL changes in accordance with the optical image of the subject O imaged thereon.

As described above, the power supply vb is connected between the transparent @pole Et in the write head WH and the electrode E in the information recording medium RM.

As described above, the electric resistance value of the photoconductive layer member PCL changes in accordance with the optical image of the subject ○ imaged thereon, so that the photoconductive layer member PCL of the writing head WH and the charge retention layer member of the information recording medium RM are The voltage between the IL and IL changes according to the optical image of the object O described above.

The charge image formed on the charge retention layer member IL of the information recording medium RM by the discharge generated between the photoconductive layer member PCL of the writing head W'H and the charge retention layer member of the information recording medium RM is as described above. It corresponds to the optical image of subject ○.

Reading charge image information from the information recording medium RM on which a charge image corresponding to the information to be recorded is recorded using the recording system described with reference to FIG. This can be done by applying a conventional information reading means or an optical information reading means.

When the charge image information is read out from the information recording medium RM by applying, for example, an optical information reading means, a light modulating material whose light state changes depending on the applied electric field strength is used. This is carried out as illustrated in FIG. 5 using the charge image information reading head RH configured using the above-described method.

FIG. 5 shows a configuration example of an optical information recording/reproducing apparatus RA in which reading of charge image information from an information recording medium RM is performed by applying an optical information reading means, and in FIG. A substrate of the recording medium RM, E is an electrode of the information recording medium, IL is a charge retention layer member of the information recording medium RM, and the charge retention layer member IL of the information recording medium RM is
A dielectric mirror D in the read head RH, which has a function of optically reading charge image information, is located at a position facing the surface of the read head RH.
ML is located.

The read head RH shown in FIG. A dielectric mirror DML is provided on one surface of the light modulating material layer (such as a layer of niobium oxide or a layer of twisted nematic liquid crystal), and a transparent electrode Etr is provided on the other surface.

In FIG. 5, the surface of the charge retention layer member IL in the information recording medium RM is brought close to the surface of the dielectric mirror DML of the read head RH described above, so that the electric field of the charge image on the charge retention layer member IL is applied to the read head RH. When light is applied to the light modulating material layer member PML and is incident on the other surface of the light modulating material layer member PML from the transparent electrode Etr of the read head RH, the light passes through the light modulating material layer member PML. The light is then reflected by the dielectric mirror DML, and the reflected light passes through the light modulating material layer member PML again 6 and exits from the transparent electrode Etr on the incident side.

As described above, the angle of the polarization plane of the light emitted from the transparent electrode Etr and the angle of the polarization plane of the incident light change corresponding to the amount of charge in the charge image described above.

Therefore, for example, the light beam emitted from the laser light source LS is passed through the polarizer PL to be converted into a linearly polarized light beam, and then made to enter the optical deflector PDEF.

The optical deflector PDEF outputs the light beam incident thereon as being deflected in two orthogonal directions like a raster drawn on a display in a television device.

The light beam emitted from the optical deflector PDEF in the above state is made into parallel light by the collimator lens L1, which converts the incident light into parallel light and outputs it, and the parallel light beam enters the beam splitter BS.

The light flux incident on the beam splitter BS is condensed by a lens L2, and is incident on the above-mentioned reading head RH. And the dielectric mirror D in the read head RH mentioned above.
Since the surface of the charge retention layer member IL in the information recording medium RM that stores recorded information in the form of a charge image faces the ML side, the light modulating material layer member PML in the reading element faces the ML side.
An electric field due to a charge image recorded on the surface of the charge retention layer member IL in the information recording medium RM is applied to the information recording medium RM via the dielectric mirror DML.

Therefore, when light enters from the transparent electrode Etr side in the reading head RH, the incident light passes through the light modulating material layer member PML.
The light passes through the light modulating material layer member PML, is reflected by the vifft body mirror DML, and passes through the light modulating material layer member PML again, and the light passes through the transparent electrode E.
The angle of the plane of polarization of the light emitted from the reading head mentioned above corresponds to the angle of the plane of polarization of the incident light, which corresponds to the amount of charge of the charge image in the information recording medium RM mentioned above. Things are changing.

As mentioned above, the light emitted from the read head RH is
The amount of rotation of the plane of polarization of the light incident on the pickup lid RH changes depending on the amount of charge of the charge image on the information recording medium RM that stores recorded information in the form of a charge image. , and is in a state of parallel light due to the already mentioned collimator lens L1.

Therefore, when the above-described emitted light from the reading head RH passes through the lens L2 and the beam splitter BS and then enters the condenser lens L3, the light beam condensed by the condenser lens L3 is always at the same position. The light is focused on.

The light condensed by the condensing lens L3 described above is passed through a wavelength plate WP for setting an optical bias and an analyzer AL for converting the amount of rotation of the polarization plane into a change in brightness. When the photoelectric converter PD is placed at the position of the condensing point of the condensing lens L3, the photoelectric converter PD detects the charge amount of each part of the two-dimensional charge image on the information recording medium RM. A video signal whose amplitude changes accordingly is obtained.

As described above, the video signal output from the photoelectric converter PD corresponds to the charge amount distribution in a two-dimensional charge image having high definition on the information recording medium RM.

(Problems to be Solved by the Invention) By the way, in the conventional recording and reproducing apparatus described with reference to FIGS. A reading head RH that displays information facing the information recording medium with a small distance therebetween.
1. That is, a reading head RH is used which is configured to include at least a light modulating material layer member and has a function of optically reading charge image information. In order to read an image well, it is necessary to arrange the reading head RH in such a manner that a constant small distance is maintained between the surface of the information recording medium and the reading head RH.

That is, when reading a charge image on the information recording medium RM, if the distance between the surface of the information recording medium and the reading head RH is increased, the electric field from the charge image recorded on the information recording medium RM expands. read head R in state
This is because the charge image recorded on the information recording medium RM in a high resolution state may be readable only in a low resolution state.

However, the surface of the above-mentioned information recording medium and the reading head R
There is a problem in that a complicated configuration is required to arrange the reading head RH and the information recording medium RM so as to face each other while maintaining a constant and small distance from the information recording medium RM.

Further, as described above, when the information recording medium RM records and holds a charge image on its surface, there is also a problem in the storage stability of the charge image.

(Means for Solving Eight Problems) The present invention provides an information recording medium in which at least electrodes and a light modulating material layer member having a memory effect are laminated.

A recording member including at least an electrode and a photoconductive layer member is disposed facing each other, and the recording member and the recording member generated by the voltage applied to the picture electrode and the electromagnetic radiation incident on the recording member. Based on the electric field intensity distribution between the information recording medium and the information recording medium, the light modulating material layer member having a memory effect changes the intensity with respect to electromagnetic radiation for reproduction in accordance with the information to be recorded. The information targeted for recording is recorded on an information recording medium in a recording manner that may cause An information recording and reproducing method is provided that reproduces electromagnetic radiation that exhibits corresponding intensity changes.

(Function) An information recording medium in which at least an electrode and a light modulating material layer member having a memory effect are laminated, and a recording member including at least an electrode and a photoconductive layer member are arranged facing each other, and A light modulating material having a memory effect in an information recording medium based on the electric field intensity distribution generated between the recording member and the information recording medium due to the voltage applied to the picture electrode and the electromagnetic radiation incident on the recording member. Recording information to be recorded on an information recording medium in a manner such that the layer member can cause an intensity change in electromagnetic radiation for reproduction in accordance with the information to be recorded. .

The information recorded by the recording means described above is
Reproduction electromagnetic radiation is made incident on a recorded recording medium recorded on a light modulating material layer member having a memory effect in the information recording medium, and electromagnetic radiation exhibiting an intensity change corresponding to recorded information is reproduced.

(Example) Hereinafter, specific contents of the information recording/reproducing method of the present invention will be explained in detail with reference to the accompanying drawings.

2 is a block diagram showing an example of the configuration of a recording system in the information recording and reproducing method of the present invention, and FIG. 3 is a block diagram showing an example of the configuration of a reproducing system in the information recording and reproducing method of the present invention. It is a diagram.

In FIGS. 1 and 2 showing an example of the configuration of a recording system in the information recording and reproducing method of the present invention, ○ is a subject, L is an imaging lens, ■b is a power source, and WH is an electrode Et and a photoconductive layer member PCL.
RM is a recording member (writing head) consisting of a laminated structure with a light modulating material layer member P having a memory effect.
This is an information recording medium having a laminated structure of M L m and an electrode E.

The information recording medium RM described above includes, for example, a light modulating material layer member P that has a memory effect and can operate in a scattering mode.
The information recording medium RM may be a light modulating material having a memory effect, such as a thin film of PLZT porcelain that has a memory effect and operates in a scattering mode. Layer member P M
The structure may be such that L m and the electrode E are stacked on the substrate. The quality of the memory function of the PLZT porcelain used as the above-mentioned light modulating material layer member PML is determined by PLZT.
It is well known that by changing the composition of porcelain, ceramics exhibiting predetermined characteristics can be easily obtained.

The above-mentioned electrodes Et and E can be constructed using, for example, a thin metal film, a NES film, etc.
The ff1 member PCL can be constructed of a thin film made of a suitable photoconductive material.

In the recording system shown in FIGS. 1 and 2, the transparent electrode Et in the write head WH has a voltage of 1 V.
The positive electrode of the power source vb is connected to the electrode E of the information recording medium RM, and the negative electrode of the power source vb is connected to the electrode E of the information recording medium RM.

In the recording system shown in FIG. 1, the information recording medium RM and the recording head WH are arranged facing each other with a discharge gap between them, and the optical image of the object 0 is captured by the imaging lens L using the light of the writing head WH. When the photoconductive layer member PCL4 is imaged, the electrical resistance value of the photoconductive layer member PCL changes in accordance with the optical image of the subject ○ imaged thereon.

As described above, since the power supply vb is connected between the transparent electrode Et in the write head WH and the electrode E in the information recording medium RM, the electric resistance value of the photoconductive layer member PCL is However, the subject imaged on it○
By changing according to the optical image of the write head W
The voltage between the photoconductive layer member PCL of H and the light modulating material layer member PML having a memory effect in the information recording medium RM is.

It changes according to the optical image of the subject ◯ described above.

Then, the light modulating material layer having a memory effect in the information recording medium RM is generated by the discharge generated between the photoconductive layer member PCL of the writing head WH and the light modulating material layer member PML having a memory effect in the information recording medium RM. Part P
The charge image formed on M L m corresponds to the optical image of the subject ◯ described above.

Thereby, the light modulating material layer member PML having a memory effect in the information recording medium RM changes depending on the distribution of the electric field intensity due to the charge image.
The state of polarization of the PLZT porcelain that constitutes rn changes. That is, in the recording system shown in the first diagram, the information recording medium RM and the recording head described above are generated due to the voltage applied between the electrodes of the information recording medium RM and the writing head WH and the electromagnetic radiation incident on the writing head WH. Based on the electric field strength distribution between the information recording medium R and the WH
Light modulating material layer member PMLm having memory effect in M
The information to be recorded is stored in a recording manner that can cause a change in the intensity of electromagnetic radiation for reproduction in correspondence with the information to be recorded, and the information to be recorded is ! , the distribution mode of the change in the polarization state of the PLZT ceramic constituting the light modulating material layer member PMLm having a memory effect in the recording medium RM is the light modulating material layer member P
Even if the charge image formed on the surface of M L m disappears, the PL constituting the light modulating material layer member P M L m
The distribution of changes in the polarization state of the ZT porcelain is maintained as it is.

Next, in the recording system of FIG.
When the image is formed, the electrical resistance value of the photoconductive layer member PCL is
It changes according to the optical image of the subject Q formed thereon.

In the recording system shown in the second diagram, the information recording medium RM and the recording head WH are arranged facing each other in such a manner that the recording operation is performed in a state where no discharge occurs between them (for example, the information recording medium RM The information recording medium RM and the recording head WH may be arranged so that the two are arranged in close contact with each other so that no discharge gap v1 is created between the information recording medium RM and the recording head WH, or the information recording medium RM and the recording head WH are arranged so that an rID gap is formed. Even so, during the recording operation, an electric field is generated with an electric field strength such that no discharge occurs between the two), and the optical image of the object ○ is captured by the imaging lens L on the writing head WH. When an image is formed on the photoconductive layer member PCL, the electrical resistance value of the photoconductive layer member PCL changes in accordance with the optical image of the subject ○ imaged thereon.

As described above, since the power supply vb is connected between the transparent electrode Et in the write head WH and the electrode E in the information recording medium RM, the electric resistance value of the photoconductive layer member PCL is but.

The electric field strength between the photoconductive layer member PCL of the writing head WH and the light modulating material layer member PML having a memory effect in the information recording medium RM changes according to the optical image of the object O imaged thereon. The state of the distribution of
It changes according to the optical image of the subject ◯ described above.

The state of the electric field intensity distribution generated between the photoconductive layer member PCL of the writing head WH and the light modulating material layer member PML having a memory effect in the information recording medium RM is as follows: - Information recording medium RM PL constituting the light modulating material layer member PML having a memory effect in RM
Changes the state of polarization of ZT porcelain. That is, in the recording system shown in FIG. 2, the information recording medium RM and the writing head W
The voltage applied between the electrodes at H and the write head W
Based on the electric field intensity distribution between the information recording medium RM and the recording head WH caused by the electromagnetic radiation incident on the information recording medium RM, the light modulating material layer member PML having a memory effect in the information recording medium RM m stores the information to be recorded in a recording manner that can cause an intensity change in the electromagnetic radiation for reproduction in correspondence with the information to be recorded, and the above-mentioned information Light modulating material layer member P having memory effect in recording medium RM
The distribution of changes in the polarization state of the PLZT ceramic that constitutes M L m is such that even if the electric field applied to the light modulating material layer member PMLm for recording information disappears, the light modulating material layer member PMLm remains unchanged. The distribution of changes in the polarization state of the PLZT porcelain constituting PMLm is maintained as it is.

In the recording system illustrated in the construction drawings and FIG. For example, the light whose intensity is modulated depending on the information to be recorded may be transmitted to the write head WH.
Desired information can be recorded by projecting the information onto the screen.

Note that when the light whose intensity is modulated according to the information to be recorded is projected onto the writing head WH, the light is deflected by an optical deflector so as to have a desired scanning pattern, or the light is modulated according to the information to be recorded. A large-area light beam having an intensity distribution can be applied to the writing head WH.

The information recording medium RM on which information to be recorded using the write head WH is to be written may be configured as a disk, tape, sheet, card, or any other arbitrary form, To reproduce the recorded information from the recorded information recording medium RM on which the information targeted for recording has been recorded as described above, for example, simply projecting the read light RL onto the recorded information recording medium RM. However, the manner of reproducing and using the information recorded on the recorded information recording medium RM is as follows.
For example, the recorded information recording medium RM is scanned with a readout beam that is optically deflected in a predetermined scanning manner, and thereby the reproduction light obtained from the recorded information recording medium RM is photoelectrically converted to correspond to the recorded information. By obtaining and using an electric signal, or by projecting a reading light and projecting the reproduction light obtained from the recorded information recording medium RM onto a screen, or by projecting the reading light again, the recorded information recording medium RM can be used. The reproduced light obtained from the RM can be used in its optical state by being subjected to signal processing by an optical signal processing device.

The reproduction system illustrated in FIG. 3(a) makes the readout light RL incident on the recorded information recording medium RM, and modulates the light transmitted through the recorded information recording medium RM, that is, the optical modulation in the information recording medium RM. When the light passes through the light modulating material layer member PMLm, the degree of scattering of the light is made to be different according to the recorded information stored in the light modulating material layer member PMLm, and the light is stored in the light modulating material layer member PMLm. In this embodiment, reproduction light whose intensity is modulated in accordance with recorded information is output. When the information recording medium RM is configured as a reflective type, the readout light incident on the recorded information recording medium RM is transmitted through the light modulating material layer member P M
It goes without saying that the reflected light whose intensity is modulated according to the recorded information stored in L m is output from the recorded information recording medium RM.

The reproduction system illustrated in FIG. 3(b) is an optical i1W L S
Q (For example, laser light sources, xenon lamps, and other light sources.

- In the following description, the laser beam emitted from a laser light source) is deflected in a predetermined deflection manner by an optical deflector PDEF, and the recorded information storage medium RM is scanned through a lens L1. , the light transmitted through the recorded information recording medium RM, that is, the f17 report@'W;body RM
When the light passes through the light modulating material layer member PMLm, the degree of scattering of the light is made to be different according to the recorded information stored in the light modulating material layer member PMLm, and the light is stored in the light modulating material layer member PMLrn. The reproduction light whose intensity has been modulated in accordance with the recorded information is applied to the photoelectric converter PD via the lens L2, so that the photoelectric converter PD outputs an electric signal corresponding to the recorded information. This is an example of the configuration when

Note that as the above-mentioned photoelectric converter PD, a suitable one can be used from among a phototransistor, a one-dimensional image sensor, a two-dimensional image sensor, and the like. Photoelectric converter P
What kind of configuration is used as D is the mode of optical deflection in the optical deflector PDEF and the main scanning of the photoelectric converter PD.

It is determined depending on the mode of sub-scanning.

In the configuration example illustrated in FIG. 3(b), the laser beam emitted from the laser light source LSfl is transferred to the optical deflector PDEF.
The image information is obtained by deflecting the light in a predetermined manner in a predetermined deflection manner on the time axis, but in practice, the light emitted from the light source is converted into a large-area light beam on the recorded information recording medium RM. The entire surface of the area may be irradiated at the same time, and two-dimensional optical signals may be obtained as simultaneous signals.

Next, in the reproducing system shown in FIG. 3(c), the light flux (reading light) emitted from the light gL S rn illuminates the entire surface of the recorded information recording medium RM via the lens L3. . The above reading light is a recorded information recording medium RM.
When the light passes through the light modulating material layer member PMLm, the degree of scattering of the light is made to vary according to the recorded information stored in the light modulating material layer member PMLm, so that the light modulating material layer member PMLm A reproduced image is projected on the screen S by projecting the reproduced light whose intensity has been modulated in accordance with the recorded information stored in the memory card m onto the screen S via the lens L4.

As described above, the light modulating material layer member P M of the information recording medium RM
Since L m uses a material having a memory effect, for example, a thin film of PLZT porcelain having memory properties, as the light modulating material layer member P M L m that can operate in a scattering mode, the same It can be used effectively when reproducing information over time.

However, since the light modulating material layer member PMLm is constructed using PLZT porcelain that exhibits a good memory function,
An erasing operation is required when changing the information content to be read, but erasing is performed on the recorded information recording medium R.
Previously recorded information can be easily erased by heating the PLZT porcelain constituting the M light modulating material layer member PMLm to a temperature higher than the cue point temperature.

In order to facilitate the above-described erasing operation, the information recording medium R
It is a desirable embodiment that a heating layer is integrally provided in M, and the erasing operation of the recorded information is performed by supplying heating power to the heating layer during the erasing operation.

(Effects of the Invention) As is clear from the above detailed explanation, the information recording and reproducing method of the present invention includes an information recording medium in which at least electrodes and a light modulating material layer member having a memory effect are laminated;
A recording member including at least an electrode and a photoconductive layer member is disposed facing each other, and the recording member and the recording member generated by the voltage applied to the picture electrode and the electromagnetic radiation incident on the recording member. Based on the electric field intensity distribution between the information recording medium and the information recording medium, the light modulating material layer member having a memory effect changes the intensity with respect to electromagnetic radiation for reproduction in accordance with the information to be recorded. The information to be recorded is recorded on the information recording medium in a manner that may cause the information to be recorded, and the information to be recorded is recorded by injecting electromagnetic radiation for reproduction into the recorded recording medium. In an information recording and reproducing system that reproduces electromagnetic radiation that exhibits intensity changes corresponding to information, an information recording medium that includes a light modulating material layer member that has a memory effect is used as a recording member. Based on the electric field strength distribution between the information recording medium and the information recording medium B, the light modulating material layer member having a memory effect in the information recording medium responds to electromagnetic radiation for reproduction in accordance with the information to be recorded. The information targeted for recording is recorded on an information recording medium in a recording manner that can cause intensity changes, and the information targeted for recording is recorded by injecting electromagnetic radiation for reproduction into the recorded recording medium. Since electromagnetic radiation is reproduced that exhibits a change in intensity corresponding to the information, there is no need to use a read head as in conventional devices when reading recorded information from a recorded recording medium. In a conventional recording/reproducing device, during reproduction, recorded information recorded in the form of a charge image on the information recording medium RM is read from the information recording medium by a reading head disposed facing the information recording medium with a small distance therebetween. The problem is that in order to read the charge image in RM well, a complicated configuration is required to arrange the read head in such a way that a constant minute distance is maintained between the surface of the information recording medium and the read head. However, this does not occur in the present invention, and since the information recording medium does not need to record and hold a charge image on its surface, the storage stability of the recording is also good. According to the present invention, all of the conventional problems mentioned above can be satisfactorily solved. Furthermore, a light modulating material layer member having a memory effect and capable of operating in a light scattering mode is used as a recording member in the information recording medium.

There is no need to use a polarizer or an analyzer that is required in conventional devices, and a playback device with high playback efficiency can be easily configured, and information such as still images can also be played back well.

[Brief explanation of drawings]

1 and 2 are block diagrams of an example of the configuration of a recording system in the information recording and reproducing method of the present invention, FIG. 3 is a block diagram of an example of the configuration of a reproducing system in the information recording and reproducing method of the present invention, and FIG.
The figure is a block diagram of a recording system, and FIG. 5 is a block diagram of a conventional charge image information reproducing apparatus.

Claims (1)

[Claims] 1. An information recording medium in which at least an electrode and a light modulating layer member having a memory effect are laminated, and a recording member including at least an electrode and a photoconductive layer member. The memory effect in the information recording medium is determined based on the electric field intensity distribution between the recording member and the information recording medium, which are arranged facing each other and are generated by the voltage applied to the two electrodes described above and the electromagnetic radiation incident on the recording member. The information to be recorded is recorded in a recording manner such that the light modulating material layer member having the above-mentioned structure can cause an intensity change in the electromagnetic radiation for reproduction in accordance with the information to be recorded. Information recording and reproducing method 2, in which information is recorded on a medium, and reproducing electromagnetic radiation is made incident on the recording medium in which information to be recorded is already recorded, thereby reproducing electromagnetic radiation that exhibits an intensity change corresponding to the recorded information; The information recording/reproducing method according to claim 1, wherein PLZT porcelain having a light scattering effect and a memory effect is used as the light modulating material layer member.